Using an LED to write or draw onto paper?
Last night i went to a bar in brixton after seeing massive attack. In the bar there were frames on the walls with white paper inside and we were given LED torches similar to these LED Torch
. When the torch is on you can use it to write or draw onto the frame and it leaves a glowing trail which slowly fades. I really want to know how its done, as it was very entertaining and quite trippy and i want to make one myself. If anyone has any ideas please reply.